If federal lawmakers and their alphabet agencies refuse to obey the very document on which their political authority and legitimacy is based, then it is up to state and local governments to pass and enforce laws like the Intrastate Commerce Act, which explicitly remind the feds where their authority ends.

Regardless of its logical descent from our most basic founding principle, that governments derive their just powers from the consent of the governed, nullification simply doesn’t work, critics say. Or does it?